BBC
The use of laser pens has become a distinctive feature of the protests against the country's leadership, which began at the end of last month. So why are they being used? Mostly just for fun, according to the BBC's Angy Ghannam in Cairo. "It started as a way to check the rooftops of buildings to get a feel if someone is there, such as snipers," our reporter says. "They are sold like crazy at the square. Street vendors are all over the place. "Anything at the square turns into a trend and a fashion in no time."
Mostly green, probably bought in bulk from China.